Investigation of thermal behaviour of hybrid nanostructures based on Fe2O3 and PAMAM dendrimers

• Published in: Journal of thermal analysis and calorimetry 2012-10, Vol.110 (1), p.357-362
• Main Authors: Popescu, Laura Madalina, Piticescu, Roxana Mioara, Stoiciu, Maria, Vasile, Eugeniu, Trusca, Roxana
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Applied sciences; Chemistry; Chemistry and Materials Science; Composites; Exact sciences and technology; Forms of application and semi-finished materials; Inorganic Chemistry; Measurement Science and Instrumentation; Physical Chemistry; Polymer industry, paints, wood; Polymer Sciences; Technology of polymers
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-012-2352-0

Dendrimers or biofunctionalized dendrimers can be assembled onto magnetic iron oxide nanoparticles to stabilize or functionalize inorganic nanoparticles. Carboxylated poly(amidoamine) PAMAM dendrimers (generation 4.5) have been used for the synthesis of iron oxide nanoparticles, resulting nanocomposites with potential biomedical applications. The present paper aims to systematically investigate the thermal behaviour of nanostructured hybrids based on ferric oxide and PAMAM dendrimers, by differential scanning calorimetry (DSC) technique. The novelty consists both in synthesis procedure of hybrid nanostructures as well as in DSC approach of these nanocomposites. For the first time, we propose a new method to prepare Fe 2 O 3 —dendrimer nanocomposite, using soft chemical process at high pressure. Commercial PAMAM dendrimers with carboxylic groups on its surface were used. When high pressure is applied, polymeric structures suffer morphological changes leading to hybrid nanostructures' formation. In the same time, crystallinity of inorganic nanoparticles is provided. DSC results showed an increase in thermal stability of composites as compared to commercial dendrimers. This could be due to the formation of strong interactions between ferric oxide and carboxyl groups, as confirmed by Fourier transform infrared spectroscopy. Electron microscopy analysis (SEM/EDX) and size measurements were performed to demonstrate the existence of nanosized particles.